Have you gone to Windows and selected Show Docking Headers? You must do this or you won't be able to re-arrange your workspace.

There are also limits to how much you can re-arrange the space.

In fact, the Help file is wrong. You will NOT see these "drop zones" as you move the panels around. Once you undock a panel, it becomes a floating window and you can drag it to anywhere on our desktop. You can not, however, re-link it to the program's interface without going to Window and selecting Restore Workspace.

Steve, fire up your PRE7. Display Audio Meters and [Ctrl]-Drag to the right-hand edge of the Timeline - up pops a drop-zone. Release the mouse and the meters fit directly into the GUI as a docked pane - exactly as Rob describes. And it works with docking headers hidden.

I'm pretty sure I could have made more use of it if I'd known about it - adding/removing extra panes 'on demand'. And without the annoying way that floating windows can so quickly disappear beneath others. Perhaps not so important for users with multiple monitors. It does seem strange though to remove Gui functionality from a product.

I wonder whether program developers are really using their stuff, I used this always (but maybe I'm the only one in the world).

While not specific to PrE (mostly have the default setup, as I have it on a tiny 17" laptop monitor), but I have manipulated almost all of my Panels, and dropped some into other tabbed Panes, in PrPro. That interface makes the operation so very, very simple. Now, I use that program mainly on a dual-monitor setup, so I have a ton of screen real estate to play with. You are not alone, trust me. I just did not know all the ins-n-outs with PrE, and especially with PrE 9, but Steve and Neale do. I actually learned some things from your post - thank you.